Hello,
Sorry for the delay in my reply. Yes, the product number is correct, but I'm not sure which operating system you are using. When you restored, how did you do it?
Take a look at this link for the no sound issue
Take a look at this link for the wifi issue
When you go to the links, you will see there are separate links for different operating systems. Select yours, and then follow the troubleshooting steps.
Please let me know if this helps.
Good luck!